Virtual Reality (VR) is a computer-generated environment which can be used to simulated different real situation. With the help of the special equipment such as Head-mounted Display (HMD) and cybergloves, VR system users could have an immersive feeling as if they were really in the Virtual Environment (VE). They can even interact with the virtual objects. This technology has already been applied in various areas. E.g. pilots training and entertainment.